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Negative rake blades are pretty niche tbh. Their main use is for clean cuts on veneers, not sure it'd solve the problem.
Disclaimer, I did cut a 3mm thick aluminium extrusion with it once so its possible I'm just a tool abuser
I mean, if this is in the week when it went blunt, we may have our answer. That being said, ally won't kill a blade completely, a single small cut on ally shouldn't make a drastic difference.
Nef
Since @dbr is talking about saw blades, I have my own question. I'm not happy with performance of my freud 260mm 60T in my mitre saw. It's slow to cut and requires more force to to get through even soft woods than I'd like. It was good for like a week but seems to have blunted quickly which has got me thinking it might be the wrong type of blade. It has a positive rake, am I right in thinking that a negative rake blade would work better / cut faster / last longer in a mitre saw?
For reference the freud is this https://www.ffx.co.uk/tools/product/Freud-Lcl6M01051-8025331492227-260-X-2.6-X-30-X-60T-Portable-Saw-Blade
Thinking of replacing it with https://www.keybladesandfixings.com/collections/all-260mm/products/260mm-x-30mm-x-3-0mm-80-tooth-neg-rake-saw-blade-ks120-ks88
Disclaimer, I did cut a 3mm thick aluminium extrusion with it once so its possible I'm just a tool abuser